2005/07/13 by Chisato Yamauchi, S. Ichikawa, Shin-ichi Ichikawa +10 · 58 citations
Environmental Science · Physics and Astronomy · #Artificial intelligence #Astrophysics #Computer science #Elliptical galaxy #Galaxies: Formation, Evolution, Phenomena #Galaxy #Index (typography) #Physics #Remote Sensing in Agriculture #Sky #Species Distribution and Climate Change #Spiral galaxy #astro-ph
paper · pdf · doi:10.1086/444416
published in The Astronomical Journal 130(4), 1545-1557 (Institute of Physics) · 13 pages, 16 figures, accepted by the Astronomical Journal
arxiv created 2005/07/13 · openalex publication_date 2005/09/21 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
We devise improved photometric parameters for the morphological classification of galaxies using a bright sample from the First Data Release of the Sloan Digital Sky Survey. In addition to using an elliptical aperture concentration index for classification, we introduce a new texture parameter, coarseness, which quantifies deviations from smooth galaxy isophotes. The elliptical aperture concentration index produces morphological classifications that are in appreciably better agreement with visual classifications than those based on circular apertures. With the addition of the coarseness parameter, the success rate of classifying galaxies into early and late types increases to ≃88% with respect to the reference visual classification. A reasonably high success rate (≃68%) is also attained in classifying galaxies into three types, early-type galaxies (E+S0) and early-type (Sa+Sb) and late-type (Sc+Sdm+Im) spiral galaxies.